Workflow Suggestions is a Zia feature that spots repetitive manual activity in your CRM and proactively suggests a Workflow Rule to automate it, so you don't need to actively hunt for automation opportunities yourself.
Zia analyses recurring actions performed by multiple users in your organisation. When it notices the same action being taken consistently under similar circumstances, for example most users manually setting a Deal's priority to Urgent whenever its Closing Date is two days away, it suggests a Workflow Rule that would automate exactly that.
Zia suggests workflows for the Leads, Contacts, Accounts, and Deals modules.
Zia also offers Macro Suggestions, which work the same way but at an individual level rather than organisation-wide. If you personally repeat the same set of actions across records, such as a fixed sequence of steps for Leads that have gone seven days without contact, Zia suggests creating a macro for your own use, rather than a shared Workflow Rule for the whole organisation.